軟密封閘閥和硬密封閘閥是閘閥系列的兩大類。硬密封和軟密封有時可以相互彌補，有時獨立。軟密封閘閥和硬密封閘閥有什么關系？主要區別是什么？接下來，良工閥門廠家小編將為您解開這些謎團。

Soft sealed gate valves and hard sealed gate valves are two major categories of gate valve series. Hard sealing and soft sealing can sometimes complement each other, and sometimes they are independent. What is the relationship between soft sealed gate valves and hard sealed gate valves? What are the main differences? Next, the editor of Lianggong Valve Manufacturer will unravel these mysteries for you.

密封材料

sealing material 

軟密封閘閥:密封副的一側是金屬材料，另一側是彈性非金屬材料，稱為“軟密封”。這種密封性能好，但不耐高溫，易磨損，機械性能差。

Soft seal gate valve: One side of the sealing pair is made of metal material, and the other side is made of elastic non-metallic material, which is called a "soft seal". This type of sealing performance is good, but it is not resistant to high temperatures, is prone to wear, and has poor mechanical performance.

硬密封閘閥：密封副兩側為金屬材料或其他硬材料，稱為“硬密封”。該密封性能差，但耐高溫耐磨機械性能好。

Hard sealed gate valve: The two sides of the sealing pair are made of metal or other hard materials, which is called a "hard seal". The sealing performance is poor, but it has good high-temperature and wear-resistant mechanical properties.

結構機理

Structural mechanism

硬密封閘閥是金屬和金屬之間的密封，密封球和閥座是金屬的。加工精度和工藝難度大，一般用于高壓，通常超過35MPa。軟密封閘閥是金屬和非金屬之間的密封，如尼龍四氟乙烯，制造標準相同。

A hard sealed gate valve is a seal between metals, with the sealing ball and seat made of metal. The machining accuracy and process difficulty are high, generally used for high pressure, usually exceeding 35MPa. Soft sealed gate valves are seals between metal and non-metal materials, such as nylon tetrafluoroethylene, manufactured to the same standard.

設備選型

Equipment Selection 

軟硬密封閘閥的選擇主要基于工藝介質溫度和壓力。一般介質中含有固體顆粒或磨損或溫度高于200度。如果直徑大于50，閥門壓差大，也應考慮開啟閥門的扭矩大小。扭矩大時應選用固定硬密封球閥，軟硬密封的密封等級可達6級。

The selection of soft and hard sealed gate valves is mainly based on the temperature and pressure of the process medium. Generally, the medium contains solid particles or is worn or has a temperature higher than 200 degrees. If the diameter is greater than 50 and the valve pressure difference is large, the torque required to open the valve should also be considered. When the torque is high, fixed hard sealed ball valves should be selected, and the sealing level of soft and hard seals can reach level 6.

使用條件

Usage conditions

軟密封閘閥一般密封能達到很高的水平，硬密封應根據要求高或低；軟密封需要防火，因為在高溫下，軟密封材料會泄漏，硬密封沒有這個問題；硬密封一般可以做高壓，軟密封不好；軟密封由于介質問題，有些場合不能使用，后硬密封閥一般比軟密封貴。至于制造，兩者差別不大，主要是閥座的區別，軟密封是非金屬的，硬密封是金屬的

Soft sealed gate valves generally achieve a high level of sealing, while hard seals should be high or low according to requirements; Soft sealing needs to be fireproof because at high temperatures, the soft sealing material will leak, while hard sealing does not have this problem; Hard sealing can generally be used for high pressure, while soft sealing is not good; Soft seals cannot be used in some situations due to medium issues, and hard sealed valves are generally more expensive than soft seals. As for manufacturing, there is not much difference between the two, mainly due to the difference in valve seats. Soft seals are non-metallic, while hard seals are metallic